Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d8b0b3a299f543…

MALICIOUS

PDF

124.0 KB Created: 2020-11-10 21:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b960ccb243f513b4f550d32ffe44ecbb SHA-1: 1fa87697eb34a30b9278de1d866e57defe431ced SHA-256: 80d8b0b3a299f543a83822abe8b6e3e4ab8e9f6d2cf1939a6c87622bc684e06d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/123?keyword=neuronal+activity+marker PDF link annotation
    • https://sopizelofixafav.weebly.com/uploads/1/3/4/4/134438569/gibufubokutarepumine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5fa3dfce5063b.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/b3ddd1a49eac2a.pdfIn PDF document text
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/fipixovaw_fanoje_zakepekemage_nufasosileje.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/degogedego-dojidetudi-zuwixeva-wedupojopofege.pdfIn PDF document text
    • https://ledekatibawe.weebly.com/uploads/1/3/4/2/134265754/pagemadakade_newirajoj_xukulit_vulut.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/e55bc6ed868b757.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/nidale-kokopafupoxa-veripinu-duvakipusomes.pdfIn PDF document text
    • https://jiluzeros.weebly.com/uploads/1/3/4/3/134365673/5068281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f8e4ddb966e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/pears_provider_manual_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gamosemukulo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3DE 4964 bytes
SHA-256: 65c01483c8843a9d53149e426c5e6d784bbe6c2b95f5e860fbf93938f3d4211b
font_01_sfnt_off0001b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4BD 13616 bytes
SHA-256: fedff162fabb02990e748240b880b1e737ba043e2fb4f7adf74153eedd6cbb98

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